We perform lemmatization and temporal expression extraction with CoreNLP [1]}, [2]}, using document publication dates to ground temporal expressions for gvc and fcct.
We manually converted complex TIMEX expressions into date and time (so that 2020-01-01TEV becomes 2020-01-01T19:00).
For ecbp and gvc where participant, time, and location mentions are not linked to the action mention, we applied the SRL system by [3]} as implemented in AllenNLP [4]}. We map spans with labels ARGM-DIR or ARGM-LOC to the location, ARGM-TM to the time and ARG0 or ARG1 to the participants of each respective event mention.
For all corpora we perform entity linking to DBPediahttps://dbpedia.org – We used the latest release from April 1st, 2020. via DBPedia Spotlight [5]}.
